Estimating Reservoir Mechanical Properties Using Constant Offset Images of Reflection Coefficients and Incident Angles
Roger Parson
Norman Bleistein recently proposed a modification of the back-projection
method used by Gregory Beylkin in his velocity inversion algorithm. Bleistein's
modification provides an algorithm for imaging
reflection coefficients and
incident angles of specular reflectors within the
earth
. One particular version
of the algorithm can be used to image data for a single source-receiver offset.
The images for several offsets can then be used in a multiparameter inversion
scheme to give images of changes in subsurface mechanical properties. This
development solves the problems in applying multiparameter inversion in areas
where reflector structure is complicated and effects of raypath curvature are
important.
I derive the Beylkin-Bleistein back-projection kernel for constant offset
data and depth
-dependent reference velocities. An
imaging
algorithm using the
kernel is applied to seismic data shot over two reservoirs with different gas
saturations. The results show that the multiparameter inversion method is more
useful than single parameter methods for determining reservoir gas saturation.
AAPG Search and Discovery Article #91038©1987 AAPG Annual Convention, Los Angeles, California, June 7-10, 1987.